Bicycle frame



FIG. 1 is a right, side, top, perspective view showing my new design;

FIG. 2 is an enlarged right, side, rear, perspective view thereof;

FIG. 3 is an enlarged left, side, rear, perspective view thereof;

FIG. 4 is an enlarged left, side, front, perspective view thereof;

FIG. 5 is an enlarged right, side, front, perspective view thereof;

FIG. 6 is an enlarged right, side, bottom, perspective view thereof;

FIG. 7 is an enlarged left, side, bottom, perspective view thereof;

FIG. 8 is an enlarged rear, right, perspective view thereof; and,

FIG. 9 is an enlarged rear, left, perspective view thereof.

Broken lines in FIG. 1 are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a bicycle frame, as shown. 